Fragmentation of Light Initial Quarks into Charm Measons in e+e Annihilation

  • We study the process that the light initial quarks produced in e+ e- annihilation combine with the c from glu-on splitting to form D's (D-+D6-+D0) or D 's(D-*+ Ds*-+D*0). The 'light + heavy' bound state is described by light-cone wavefunction. The contribution of this process to D (D ) production at Z0 pole is much larger compared with that in lower energies (e.g. 10.6GeV) . For this special process, the invariant mass of D(D) and the charm had-ron fragmented from the c quark has a unique spectrum which peaks near 2 MB if we constrain the D(D*) from all processes with energy larger than 20GeV. It is also noticeable that the produced D* in this process is dominantly longitudinally polarized, which is consistent with the OPAL data.
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JIN Yi, LI Shi-Yuan and XIE Qu-Bing. Fragmentation of Light Initial Quarks into Charm Measons in e+e Annihilation[J]. Chinese Physics C, 2003, 27(10): 852-856.
JIN Yi, LI Shi-Yuan and XIE Qu-Bing. Fragmentation of Light Initial Quarks into Charm Measons in e+e Annihilation[J]. Chinese Physics C, 2003, 27(10): 852-856. shu
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Received: 2003-02-17
Revised: 1900-01-01
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Fragmentation of Light Initial Quarks into Charm Measons in e+e Annihilation

    Corresponding author: JIN Yi,
  • School of Physics and Microelectronics,Shandong University,Ji'nan 250100,China

Abstract: We study the process that the light initial quarks produced in e+ e- annihilation combine with the c from glu-on splitting to form D's (D-+D6-+D0) or D 's(D-*+ Ds*-+D*0). The 'light + heavy' bound state is described by light-cone wavefunction. The contribution of this process to D (D ) production at Z0 pole is much larger compared with that in lower energies (e.g. 10.6GeV) . For this special process, the invariant mass of D(D) and the charm had-ron fragmented from the c quark has a unique spectrum which peaks near 2 MB if we constrain the D(D*) from all processes with energy larger than 20GeV. It is also noticeable that the produced D* in this process is dominantly longitudinally polarized, which is consistent with the OPAL data.

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